Grubeulepis katzmanni Pettibone 1986

Grubeulepis katzmanni

MATERIAL EXAMINED.—Middle Adriatic near Zlorin Island, Yugoslavia, 20–60 m, 1972, W. Katzmann, holotype, juvenile (USNM 67471), 3 juvenile paratypes (USNM 67472).

MEASUREMENTS.—Holotype 9 mm long, 2 mm wide with setae, segments 31, last one small. Largest paratype 6 × 2 mm, with 29 segments; 2 smaller paratypes 3–4 × 1–1.5 mm, with 18 and 20 segments. Two larger ones considered to be advanced juveniles; 2 small juveniles described separately.

DESCRIPTION OF ADVANCED JUVENILES.—Twelve pairs of elytra on usual segments; first pair rounded with numerous papillae (up to 17) on anterior border; fimbriated lateral borders of following elytra with 1–6 wide oval processes, all with terminal buds, with additional papillae on posterior borders and few scattered microtubercles on some of elytra (Figure 23A–F). Two pairs of dorsal cirri short, subulate, on posterior sides of notopodia of segments 3 and 6 (Figures 24E, 25A). Branchiae 11 pairs, on segments 8, 10, alternate segments to 22, 23, 25, 26; large, inflated, with distal papilla (Figure 25B). Posterior dorsal lamellae conical, beginning on segment 27 and continuing posteriorly (Figure 25F).

Prostomium rounded, with small bulbous median antenna, larger subulate lateral antennae and long tapered palps; 3 pairs of scattered pigment on posterolateral sides (Figure 24A). Tentaculophores lateral to prostomium, each with 2 acicula, 2 bundles of capillary setae and pair of dorsal and ventral tentacular cirri, ventral one larger and longer than dorsal one (Figure 24B). Parapodia of elytrigerous segment 2 with small conical notopodium and bundle of finely spinous capillary notosetae; neuropodium with upper pectinate seta and slender tapering limbate and non-limbate capillaries; buccal cirrus longer than following ventral cirri (Figure 24C,D). Notopodium of cirrigerous segment 3 with bundle of capillary notosetae on posterior side and stout notopodial hooks with tips tapering and blunt, spinous along bend; neuropodium with upper pectinate seta, single middle smooth acicular seta, limbate and non-limbate capillaries (Figure 24E–G).

Biramous parapodia supported by acicula; notoaciculum with hooked tip, neuroaciculum with distal hammer-shaped plate on anterior side (Figures 24H, 25C). Smaller notopodium truncate; rounded lobe on posterior side with spreading bundle of long capillary notosetae; projecting stout amber-colored notopodial hooks with tips tapering or flattened spatulate, finely spinous or smooth along bend (Figure 25A–D); neuropodium with fan-shaped bundle of neurosetae: 1–2 upper pectinate setae, middle limbate capillaries with tapering tips, and lower slender capillaries; ventral cirrus short, bulbous, with terminal bud or filament (Figure 25A–C,E).

Posterior lamelligerous parapodia with upper neurosetae stouter than lower ones, curved downward, spinous along bend, tapering to capillary tips (unless broken); notopodial hooks appearing smooth (Figure 25F–I).

DESCRIPTION OF JUVENILE OF 18 SEGMENTS AND 9 PAIRS OF ELYTRA.—First pair of elytra with papillae on anterior border and some on surface (Figure 26A). Following elytra with lateral borders somewhat wavy and up to 7 filiform processes, with some additional processes or papillae on posterior borders (Figure 26B,C).

Prostomium with bulbous median antenna; lateral antennae bulbous with terminal buds; palps long, tapering; 2 pairs of eyes near posterior border (Figure 26D). Tentaculophores lateral to prostomium, each with 2 bundles of long capillary setae; dorsal tentacular cirri subulate; ventral tentacular cirri greatly inflated basally, with short tapering tips (Figure 26D). Buccal cirri of segment 2 large, inflated basally (Figure 26D).

Biramous parapodia similar in shape to advanced juveniles; long projecting notopodial hooks spinous along bend, ending in tapering capillary or blunt tips; fan-shaped bundles of neurosetae from segment 3 on consisting of upper and lower limbate capillaries, lower non-limbate capillaries, and middle stout acicular neurosetae; acicular setae increasing in number on successive parapodia: from 1 on segment 3, to 5 on segment 17, 3 on segment 18; acicular setae smooth on segment 3, tubercled on following neuropodia; ventral cirri bulbous, with terminal filiform tips (Figure 26E,F).

ETYMOLOGY.—The species is named for Dr. Werner Katzmann, the collector of the specimens, in recognition of his contributions to our knowledge of the Adriatic polychaetes.

DISTRIBUTION.—Southern California, Gulf of California, Mexico (Isle Grand Bay), Guatemala, Panama (Pacific), intertidal to 37 meters; Gulf of Mexico, 10–48 meters; Venezuela, intertidal to 1.5 meters.